US4018709A
Expired / Lapsed
US
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Catalyst for preparing maleic anhydride from C4 hydrocarbons
Assignee: Petro Tex Chemical Corp
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Filing: 1975-03-17
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Granted: 1977-04-19
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Expires: 1995-03-17
Abstract
Abstract A catalyst complex useful for converting normal C4 hydrocarbons to maleic anhydride in vapor phase comprising as components vanadium, phosphorus, an element selected from the group of U, W, or a mixture of elements from the group Zn, Cr, U, W, Cd, Ni, B or Si.
Inventors
- 👤 Bruno J. Barone
- 👤 Ralph O. Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:26
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; C07C51/25; C07C51/252; B01J2523/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
An improved vanadium - phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of principal active components in the atom ratios vanadium 1: phosphorus 0.90 to 1.3: Me 0.005 to 0.4 wherein Me is a mixture of B and elements selected from the group consisting of Zn, Cr, U, W, Cd, Ni and Si.
Claim 2
Dependent Claim
61 words
An improved vanadium - phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of principal active components in the atom ratios vanadium 1: phosphorus 0.90 to 1.3: Me 0.005 to 0.4 wherein Me is a mixture of B and elements selected from the group consisting of Zn, Cr, U, W, Cd, Ni and Si.
Claim 3
Dependent Claim
56 words
An improved catalyst composition comprising a catalyst complex, consisting essentially of principal active components in the atom ratios vanadium 1 : phosphorus 0.90 to 1.3 : Me 0.005 to 0.4 wherein Me is a mixture of B and elements selected from the group consisting of Zn, Cr, U, W, Cd, Ni and Si, on a carrier.
Claim 4
Dependent Claim
56 words
An improved catalyst composition comprising a catalyst complex, consisting essentially of principal active components in the atom ratios vanadium 1 : phosphorus 0.90 to 1.3 : Me 0.005 to 0.4 wherein Me is a mixture of B and elements selected from the group consisting of Zn, Cr, U, W, Cd, Ni and Si, on a carrier.
Claim 5
Dependent Claim
14 words
The catalyst complex according to claim 1 wherein Me is B, Zn and Cr.
Claim 6
Dependent Claim
13 words
The catalyst complex according to claim 1 wherein Me is B and U.
Claim 7
Dependent Claim
14 words
The catalyst complex according to claim 1 wherein Me is B, Ni and W.
Claim 8
Dependent Claim
42 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of principal active components in the atom ratios vanadium 1: phosphorus 0.90 to 1.3: Me 0.005 to 0.4 wherein Me is Si and Zn.
Claim 9
Dependent Claim
42 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of principal active components in the atom ratios vanadium 1: phosphorus 0.90 to 1.3: Me 0.005 to 0.4 wherein Me is Si and Zn.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |